18053639 has 2 divisors, whose sum is σ = 18053640. Its totient is φ = 18053638.

The previous prime is 18053627. The next prime is 18053641. The reversal of 18053639 is 93635081.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18053639 - 2¹² = 18049543 is a prime.

It is a super-2 number, since 2×18053639² = 651867762284642, which contains 22 as substring.

Together with 18053641, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 18053599 and 18053608.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18053699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9026819 + 9026820.

It is an arithmetic number, because the mean of its divisors is an integer number (9026820).

Almost surely, 2^18053639 is an apocalyptic number.

18053639 is a deficient number, since it is larger than the sum of its proper divisors (1).

18053639 is an equidigital number, since it uses as much as digits as its factorization.

18053639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 18053639 is about 4248.9574015281. The cubic root of 18053639 is about 262.3342033916.

The spelling of 18053639 in words is "eighteen million, fifty-three thousand, six hundred thirty-nine".